/*
 * jQuery JSON Plugin
 * version: 2.1 (2009-08-14)
 *
 * This document is licensed as free software under the terms of the
 * MIT License: http://www.opensource.org/licenses/mit-license.php
 *
 * Brantley Harris wrote this plugin. It is based somewhat on the JSON.org 
 * website's http://www.json.org/json2.js, which proclaims:
 * "NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.", a sentiment that
 * I uphold.
 *
 * It is also influenced heavily by MochiKit's serializeJSON, which is 
 * copyrighted 2005 by Bob Ippolito.
 */

(function($) {
  /** jQuery.toJSON( json-serializble )
   Converts the given argument into a JSON respresentation.

   If an object has a "toJSON" function, that will be used to get the representation.
   Non-integer/string keys are skipped in the object, as are keys that point to a function.

   json-serializble:
   The *thing* to be converted.
   **/
  $.toJSON = function(o) {
    if (typeof(JSON) == 'object' && JSON.stringify) {
      return JSON.stringify(o);
    }

    var type = typeof(o);

    if (o === null) {
      return "null";
    }

    if (type == "undefined") {
      return undefined;
    }

    if (type == "number" || type == "boolean") {
      return o + "";
    }

    if (type == "string") {
      return $.quoteString(o);
    }

    if (type == 'object') {
      if (typeof o.toJSON == "function") {
        return $.toJSON(o.toJSON());
      }

      if (o.constructor === Date) {
        var month = o.getUTCMonth() + 1;
        if (month < 10) {
          month = '0' + month;
        }

        var day = o.getUTCDate();
        if (day < 10) {
          day = '0' + day;
        }

        var year = o.getUTCFullYear();

        var hours = o.getUTCHours();
        if (hours < 10) {
          hours = '0' + hours;
        }

        var minutes = o.getUTCMinutes();
        if (minutes < 10) {
          minutes = '0' + minutes;
        }

        var seconds = o.getUTCSeconds();
        if (seconds < 10) {
          seconds = '0' + seconds;
        }

        var milli = o.getUTCMilliseconds();
        if (milli < 100) {
          milli = '0' + milli;
        }
        if (milli < 10) {
          milli = '0' + milli;
        }

        return '"' + year + '-' + month + '-' + day + 'T' + hours + ':' + minutes + ':' + seconds + '.' + milli + 'Z"';
      }

      if (o.constructor === Array) {
        var ret = [];
        for (var i = 0; i < o.length; i++) {
          ret.push($.toJSON(o[i]) || "null");
        }

        return "[" + ret.join(",") + "]";
      }

      var pairs = [];
      for (var k in o) {
        var name;
        var type = typeof k;

        if (type == "number") {
          name = '"' + k + '"';
        } else if (type == "string") {
          name = $.quoteString(k);
        }
        else {
          continue;
        }  //skip non-string or number keys

        if (typeof o[k] == "function") {
          continue;
        }  //skip pairs where the value is a function.

        var val = $.toJSON(o[k]);

        pairs.push(name + ":" + val);
      }

      return "{" + pairs.join(", ") + "}";
    }
  };

  /** jQuery.evalJSON(src)
   Evaluates a given piece of json source.
   **/
  $.evalJSON = function(src) {
    if (typeof(JSON) == 'object' && JSON.parse) {
      return JSON.parse(src);
    }
    return eval("(" + src + ")");
  };

  /** jQuery.secureEvalJSON(src)
   Evals JSON in a way that is *more* secure.
   **/
  $.secureEvalJSON = function(src) {
    if (typeof(JSON) == 'object' && JSON.parse) {
      return JSON.parse(src);
    }

    var filtered = src;
    filtered = filtered.replace(/\\["\\\/bfnrtu]/g, '@');
    filtered = filtered.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
    filtered = filtered.replace(/(?:^|:|,)(?:\s*\[)+/g, '');

    if (/^[\],:{}\s]*$/.test(filtered)) {
      return eval("(" + src + ")");
    }
    else {
      throw new SyntaxError("Error parsing JSON, source is not valid.");
    }
  };

  /** jQuery.quoteString(string)
   Returns a string-repr of a string, escaping quotes intelligently.
   Mostly a support function for toJSON.

   Examples:
   >>> jQuery.quoteString("apple")
   "apple"

   >>> jQuery.quoteString('"Where are we going?", she asked.')
   "\"Where are we going?\", she asked."
   **/
  $.quoteString = function(string) {
    if (string.match(_escapeable)) {
      return '"' + string.replace(_escapeable, function (a) {
        var c = _meta[a];
        if (typeof c === 'string') {
          return c;
        }
        c = a.charCodeAt();
        return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
      }) + '"';
    }
    return '"' + string + '"';
  };

  var _escapeable = /["\\\x00-\x1f\x7f-\x9f]/g;

  var _meta = {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '"' : '\\"',
    '\\': '\\\\'
  };
})(jQuery);
